00344nam a2200109Ia 4500008004100000082002000041100001900061245007300080260003300153300001500186490003300201260427b        |||||||| |||| 00| 0 eng d  a515.64bM886.VA  aMorse, Marston  aVariational analysisb; critical extremals and sturmian extensions /  aNew York:bJohn Wiley,c1973  axii, 260p.  aPure and Applied Mathematics